Paul asks…
What is the boiling point of diethyl ether using enthalpy of vapourisation and entropy?
Diethyl ether ( C4 H10 O) has an ΔvapH of 28.36 kJ/mol and the phase change from liquid to gas has an ΔS° of 96.6 J/mol/K. what is the normal boiling point of diethyl ether?
weight loss cardiff answers:
At the normal boiling point, the liquid and gas phases of a material are in equilibrium. That means the free energy change for the reaction:
liquid -> gas
is zero.
You should also know that ΔG = ΔH – T*ΔS, so at equilibrium:
T = ΔH/ΔS
In this case, you are given the enthalpy and entropy of vaporization, so:
T_boiling = (28,360 J/mol)/(96.6 J/(mol*K)) = 294 K
Joseph asks…
What does diethyl ether do in the esterification of salicylic acid?
I’m writing a mechanism for the esterification of salicylic acid using thionyl cloride. Then water and diethyl ether. Then sodium bicarbonate.
I remember in lab that when the diethyl ether was added, it was just a washing process. But I don’t understand how it would fit into a mechanism.
Did it have a purpose? what did it chemically do to the molecule?
weight loss cardiff answers:
You need to give more info on what you did. Looking at your sketchy procedure there is stuff missing. What was the objective of the experiment. In any event, the diethyl ether would have been a wash solvent or an extraction solvent; it would not react under these conditions.
Charles asks…
Why is diethyl ether is more soluble in water than dihexyl ether?
Why is diethyl ether is more soluble in water than dihexyl ether? Would you expect propane or diethyl ether to be more soluble in water? Why?
weight loss cardiff answers:
That is because hexyl group is more NON-POLAR and bulky than ethyl group.. Giving much more repulsion to polar water molecule…
Hope I help you with that .. Goodluck and godbless!
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